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About

Hume Audio Decisions API is a hosted API for developers building voice applications and teams evaluating speech and sound. It accepts an audio recording, optional context, and user-defined questions, then returns probabilities for answers in structured form. Questions can cover observable audio facts, such as the number of speakers or background speech, and listener judgments about tone, naturalness, empathy, clarity, or frustration. Teams can use the results to review support calls, test voice agents and text-to-speech output, label speech corpora, compare recordings, and identify examples for escalation or model training. The API works as a decision layer alongside speech recognition and voice generation, allowing application code to use its scores and probabilities in custom workflows. API access is requested through Hume, and billing is based on audio, question, and context input tokens.

About

Naturaltts is a text-to-speech platform designed for universities, education teams, researchers, and accessibility-focused workflows. It helps organizations convert text, PDFs, and DOCX files into clear, natural-sounding audio in a structured environment built for academic and professional use. Unlike generic text-to-speech tools built mainly for individual listening, Naturaltts is designed around how education teams actually evaluate and adopt software. The platform supports real document-to-audio workflows, multilingual listening, shared team evaluation, and clearer admin visibility during pilots and rollout. Naturaltts is especially well suited for: universities and colleges accessibility and disability support teams teaching and learning departments academic operations teams researchers and multilingual academic workflows Key capabilities Convert text into speech quickly Upload and process PDF and DOCX files Select language and matching voices Generate clear audio

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Developers building voice applications and product teams evaluating speech, calls, voice agents, or other audio data.

Audience

Universities, education teams, researchers, and accessibility-focused organizations looking for a structured text-to-speech platform for document-based workflows

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Supported

API

Offers API Not Supported

Screenshots and Videos

Screenshots and Videos

Pricing

$0.47/1M tokens
Usage costs $0.47 per 1 million input tokens, with no commitment. An organization receives a 1-million-input-token trial credit after access is granted. Enterprise plans offer volume pricing and deployment in a VPC, on premises, or in country.
Free Version Not Supported
Free Trial Not Supported

Pricing

Naturaltts offers a Free Trial for individual evaluation and an EDU Trial for verified schools and universities.
Free Version Not Supported
Free Trial Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Supported
In Person Not Supported

Company Information

Hume AI
Founded: 2021
United States
www.hume.ai/products/decision-model-api

Company Information

Naturaltts
Founded: 2019
Ukraine
naturaltts.org

Alternatives

No Alternatives

Alternatives

Categories

AI Decision Models Supported

Categories

Text to Speech Supported

Text to Speech Features

Adjust Speaking Rate / Pitch Supported
API Not Supported
Audio Optimization Supported
Custom Lexicons Not Supported
Different Voice Choices Supported
Multi-Language Support Supported
Synchronize Speech Not Supported

Integrations

Hume AI Supported

Integrations

Hume AI Not Supported
Claim Hume Audio Decisions API and update features and information
Claim Hume Audio Decisions API and update features and information
Claim Naturaltts and update features and information
Claim Naturaltts and update features and information